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In fixed versions of Ambari (2.0.2; 2.1.1 and onward), access to the user resource endpoint is protected such that only a user with administrator privileges can esculate a user's privileges. A user, however, may still access the endpoint but may only change their own password.
Fixed in Ambari
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2.1.0
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CVE-2015-1775: Apache Ambari Server Side Request Forgery vulnerability
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